To begin with my thesis, or with a restatement of the title of this essay: there is no transition between Gen 50 and Exod 1. That is: the transition between Gen 50 and Exod 1 is no more distinctive from a compositional standpoint than the transition between any two chapters of the Pentateuch. That is: the transition between the narrative recounted in Gen 50 and the narrative recounted in Exod 1 is no more distinctive than the transition between any two narratives in the Pentateuch. That is: the passage of time and change in Israelite fortunes that seems to occur somewhere in the beginning of what we now call Exod 1 is entirely unremarkable from a narrative and compositional perspective.